JP5191921B2 - Extrusion processing apparatus and extruded material manufacturing method - Google Patents

Description

  The present invention relates to an extrusion apparatus for producing an extruded material and a method for producing the extruded material.

  2. Description of the Related Art Conventionally, as a rim material for motorcycles and other two-wheeled vehicles, a thick recrystallized structure layer has been conventionally formed on the inner peripheral surface of the rim material in order to obtain a sufficient brightness in appearance. Thus, conventionally, the rim material of a two-wheeled vehicle is made of, for example, an extruded material, and a recrystallized structure layer having a substantially uniform thickness is formed on the inner peripheral surface of the rim material (Patent Document). 1). By forming such a uniform recrystallized structure layer, the entire surface on the inner peripheral side of the rim material has sufficient glitter.

JP-A-63-190150

  However, the rim material of the two-wheeled vehicle often has different post-processing contents (processing degree, etc.) such as finishing buffing for each region. There has been a problem that a large number of recrystallized structure layers are shaved, resulting in a region (part) where sufficient glitter cannot be obtained.

  In addition, among various products including rim materials, it is desirable that characteristics such as mechanical strength, corrosion resistance, conductivity, thermal conductivity, and light reflection characteristics are different in each part. However, in the conventional extrusion processing apparatus, an extruded material used for such a product cannot be manufactured.

  The present invention has been made in view of the above-described technical background, and its purpose is to produce extruded materials in which various properties such as mechanical strength, corrosion resistance, conductivity, thermal conductivity, and light reflectance are different at each part. Another object of the present invention is to provide an extrusion processing apparatus and a method for producing an extruded material.

  The present invention provides the following means.

[1] An extrusion apparatus for producing an extruded material,
An extrusion apparatus characterized in that the length of the extrusion surface of the bearing surface of the extrusion die is different in the circumferential direction of the bearing surface.

[2] The extruded material is provided with a thick layer request portion that is required to form a recrystallized structure layer thicker than the other part on the surface,
The length of the extrusion direction of the part corresponding to the thick layer request | requirement part of the extrusion material in a bearing surface is set longer than the length of the extrusion direction of the part corresponding to the other site | part of the extrusion material in a bearing surface. The extrusion apparatus as described.

[3] The extruded material is provided with a low-strength demand part that is required to have lower mechanical strength than other parts, as a thick-layer demand part.
2. The length of the extrusion direction of the portion corresponding to the low strength requirement portion of the extruded material on the bearing surface is set longer than the length of the portion of the bearing surface corresponding to the other portion of the extruded material in the extrusion direction. Extrusion processing equipment.

[4] The extruded material is provided with a low-corrosion-requirement requirement part that is required to have lower corrosion resistance than other parts as a thick-layer requirement part,
The length 2 in the extrusion direction of the portion corresponding to the low corrosion resistance requirement portion of the extruded material on the bearing surface is set to be longer than the length in the extrusion direction of the portion corresponding to the other portion of the extruded material on the bearing surface or 3. The extrusion apparatus according to 3.

[5] The extruded material is used for a rim material of a motorcycle.
The portion corresponding to the spoke attachment portion of the rim material in the extruded material and the portion corresponding to the side region portion on both sides in the width direction with respect to the spoke attachment portion of the rim material are respectively designated as the spoke attachment portion and the side region of the extrusion material. Part
The extruded material is a thick layer requesting portion at least a part of the inner peripheral surface of the side region portion,
The length in the extrusion direction of the portion corresponding to the inner peripheral surface of at least a part of the lateral region portion of the extruded material on the bearing surface is the extrusion direction of the portion corresponding to the inner peripheral surface of the spoke attachment portion of the extruded material on the bearing surface. 3. The extrusion apparatus according to the preceding item 2, which is set longer than the length of.

[6] The extruded material is used for a holding member for caulking and holding the object to be held,
When the portion corresponding to the caulking portion of the holding member in the extruded material and the portion corresponding to the non-caulking portion of the holding member are respectively the caulking portion and the non-caulking portion of the extruded material,
The extruded material has a caulking portion as a thick layer request portion,
3. The extrusion according to item 2, wherein the length in the extrusion direction of the portion corresponding to the caulking portion of the extruded material on the bearing surface is set longer than the length in the extrusion direction of the portion corresponding to the non-caulking portion of the extruded material on the bearing surface. Processing equipment.

[7] A method for producing an extruded material, wherein the extruded material is produced by an extrusion processing apparatus,
A method for producing an extruded material, characterized in that the length in the direction of extrusion of the bearing surface of the extrusion die of the extruder is different in the circumferential direction of the bearing surface.

[8] The extruded material is provided with a thick layer request portion that is required to form a recrystallized structure layer thicker than other parts on the surface,
The length in the extrusion direction of the portion corresponding to the thick layer request portion of the extruded material on the bearing surface is set to be longer than the length in the extrusion direction of the portion corresponding to the other portion of the extruded material on the bearing surface. The manufacturing method of the extruded material of description.

[9] The extruded material is used for a rim material of a motorcycle.
The portion corresponding to the spoke attachment portion of the rim material in the extruded material and the portion corresponding to the side region portion on both sides in the width direction with respect to the spoke attachment portion of the rim material are respectively designated as the spoke attachment portion and the side region of the extrusion material. Part
The extruded material is a thick layer requesting portion at least a part of the inner peripheral surface of the side region portion,
The length in the extrusion direction of the portion corresponding to the inner peripheral surface of at least a part of the lateral region portion of the extruded material on the bearing surface is the extrusion direction of the portion corresponding to the inner peripheral surface of the spoke attachment portion of the extruded material on the bearing surface. The manufacturing method of the extrusion material of the preceding clause 8 set longer than the length of said.

[10] The extruded material is used for a holding member for caulking and holding the object to be held,
When the portion corresponding to the caulking portion of the holding member in the extruded material and the portion corresponding to the non-caulking portion of the holding member are respectively the caulking portion and the non-caulking portion of the extruded material,
The extruded material has a caulking portion as a thick layer request portion,
The extrusion according to item 8 above, wherein the length in the extrusion direction of the portion corresponding to the caulking portion of the extruded material on the bearing surface is set longer than the length in the extrusion direction of the portion corresponding to the non-caulking portion of the extruded material on the bearing surface. A method of manufacturing the material.

  The present invention has the following effects.

  In the invention of [1], the length in the extrusion direction of the bearing surface of the extrusion die is different in the circumferential direction of the bearing surface. Therefore, in the region where the thickness of the recrystallized structure layer formed on the surface of the extruded material is desired to be increased, the length in the extruding direction of the portion corresponding to the region on the bearing surface is set long, while the recrystallized structure layer In the region where the thickness of the extrudate is to be reduced, the recrystallized structure layer having a different thickness for each region of the surface of the extruded material is set by shortening the length in the extrusion direction of the portion corresponding to the region on the bearing surface. Can be formed. As a result, it is possible to produce extruded materials in which various properties such as mechanical properties such as mechanical strength, corrosion resistance, conductivity, thermal conductivity, and light reflection properties are different in each part (region).

  In the invention of [2], the length in the extrusion direction of the portion corresponding to the thick layer request portion of the extruded material on the bearing surface is longer than the length in the extrusion direction of the portion corresponding to the other portion of the extruded material on the bearing surface. Since it is set long, the recrystallized structure layer can be formed on the surface of the thick layer request portion of the extruded material to be thicker than other portions of the extruded material.

  In the invention of [3], the length in the extrusion direction of the portion corresponding to the low strength requirement portion of the extruded material on the bearing surface is longer than the length in the extrusion direction of the portion corresponding to the other portion of the extruded material on the bearing surface. Is set. Therefore, the recrystallized structure layer is formed thick on the surface of the low strength required portion of the extruded material, while the recrystallized structure layer is formed thin on the surface of the other part of the extruded material. Thereby, the mechanical strength of the low-strength request | requirement part of an extrusion material can be made lower than the other site | part of an extrusion material.

  In the invention of [4], the length in the extrusion direction of the portion corresponding to the low corrosion resistance requirement portion of the extruded material on the bearing surface is longer than the length in the extrusion direction of the portion corresponding to the other portion of the extruded material on the bearing surface. Is set. Therefore, the recrystallized structure layer is formed thick on the surface of the low corrosion resistance requirement portion of the extruded material, while the recrystallized structure layer is formed thin on the surface of the other part of the extruded material. Thereby, the corrosion resistance of the low corrosion resistance requirement part of an extrusion material can be made lower than the other site | part of an extrusion material.

  In the invention of [5], the length in the extrusion direction of the portion corresponding to at least a part of the inner peripheral surface of the side region portion of the extruded material on the bearing surface is the inner peripheral surface of the spoke attachment portion of the extruded material on the bearing surface. Is set longer than the length in the extrusion direction of the portion corresponding to. Therefore, the recrystallized structure layer is formed thick on the surface of at least a part of the inner peripheral surface of the side region portion of the extruded material, while the recrystallized structure layer is formed on the surface of the inner peripheral surface of the spoke attachment portion of the extruded material. Is formed thin. Therefore, even if the rim material manufactured by the extruded material is subjected to post-processing such as finishing buffing on the inner peripheral surface of at least a part of the side region of the rim material, the inner peripheral surface is recrystallized. Since the tissue layer is formed thick, sufficient glitter can be obtained.

  In the invention of [6], the length in the extrusion direction of the portion corresponding to the caulking portion of the extruded material on the bearing surface is set longer than the length in the extrusion direction of the portion corresponding to the non-caulking portion of the extruded material on the bearing surface. ing. Therefore, the recrystallized structure layer is formed thick on the surface of the caulking portion of the extruded material, while the recrystallized structure layer is formed thin on the surface of the non-caulked portion of the extruded material. Thereby, the yield strength of the caulking portion of the extruded material can be locally reduced. Therefore, the caulking part of the holding member can be deformed with a relatively weak force with respect to the holding member manufactured by the extruded material, and the caulking work can be easily performed.

  The inventions [7] to [10] have the same effects as the inventions [1], [2], [5] and [6], respectively.

FIG. 1 is a cross-sectional view of a state in the middle of manufacturing an extruded material for a rim material by an extrusion apparatus according to the first embodiment of the present invention. FIG. 2 is a longitudinal sectional view corresponding to line X1-X1 in FIG. 1, showing a state in the middle of manufacturing the extruded material. FIG. 3 is a longitudinal sectional view corresponding to line X2-X2 in FIG. 1, showing a state in the middle of manufacturing the extruded material. FIG. 4 is a cross-sectional view of a rim material manufactured by the extruded material. FIG. 5 is a cross-sectional view of a state in the middle of producing the holding member extruded material by the extrusion processing apparatus according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of a state before the holding body is caulked and held by the holding member made of the extruded material. FIG. 7 is a cross-sectional view of a state in which the holding member is caulked and held by the holding member.

  Next, several embodiments of the present invention will be described below with reference to the drawings.

  1-4 is a figure explaining the manufacturing method of the extrusion processing apparatus and extruded material which concern on 1st Embodiment of this invention. 2 and 3, 60A is an extrusion apparatus according to the first embodiment.

  The extruded material 30A manufactured by the extrusion processing apparatus 60A is used for the rim material 1 of a two-wheeled vehicle such as a motorcycle or a bicycle.

  As shown in FIG. 4, the rim material 1 is a metal annular strip (substantially short cylindrical body), and more specifically, is made of an extruded material 30A made of aluminum (including an alloy thereof, the same applies hereinafter). Further, the rim material 1 is manufactured by bending an extruded material 30A having a cross-sectional shape shown in FIG. 1 into an annular shape and joining and integrating both ends thereof by flash butt welding.

  As shown in FIG. 4, the rim material 1 includes a spoke attachment portion 2 that protrudes radially inward from other regions in the center region in the width direction, and both sides of the spoke attachment portion 2 in the width direction. A pair of side region portions 7 and 8 are provided. Each of the side region portions 7 and 8 includes tapered portions 3 and 4, and flange portions 5 and 6 extending outward from the tips of the tapered portions 3 and 4 in a substantially radial direction.

  The spoke attachment portion 2 has a substantially flat cross-sectional shape. A spoke attachment hole 21 for attaching a spoke is formed in the inner peripheral surface 11 of the spoke attachment portion 2 by drawing or the like. In addition, the inner peripheral surface 11 of the spoke attachment portion 2 is a surface on the side on which the spoke is attached.

  Each tapered portion 3, 4 is an inclined portion formed to be connected to each side edge in the width direction of the spoke attachment portion 2. That is, each taper part 3 and 4 is extended so that it may incline radially outward toward each width direction outward from each side edge of the width direction of the spoke attachment part 2. Each of the tapered portions 3 and 4 is formed in a substantially flat plate shape in cross section.

  The flange portions 5 and 6 are formed to be connected to the tips of the tapered portions 3 and 4. That is, each flange part 5 and 6 is extended from the front-end | tip of each taper part 3 and 4 toward the substantially radial direction outward. The flange portions 5 and 6 are formed in a substantially flat plate shape in cross section.

  On the surface of the inner peripheral surface 11 of the rim material 1, a recrystallized structure layer 13 is formed over the entire periphery. That is, the inside of the rim material 1 is formed of a fibrous structure, and the recrystallized structure layer 13 is formed on the inner peripheral surface 11 of the fibrous structure layer 14 over the entire circumference. The recrystallized structure layer 13 is formed to have a thickness distribution. That is, the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the tapered portions 3 and 4 of the side regions 7 and 8 is the thickness of the recrystallized structure layer 13 on the inner peripheral surface 11 of the spoke attachment portion 2. Greater than S (ie, T> S). Further, the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the tapered portions 3 and 4 is larger than the thickness U of the recrystallized structure layer 13 on the inner peripheral surface 11 of the flange portions 5 and 6 (that is, T > U). Further, the thickness U of the recrystallized structure layer 13 on the inner peripheral surface 11 of the flange portions 5 and 6 is substantially equal to the thickness S of the recrystallized structure layer 13 on the inner peripheral surface 11 of the spoke attachment portion 2 (that is, U ≒ S). Thus, of the inner peripheral surfaces 11 of the side region portions 7 and 8, it is a strong buff polishing scheduled portion (a portion where the amount of polishing is large) where the buff is pressed more strongly than other portions in the final buff polishing. Since the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the tapered parts 3 and 4 is larger than the thickness S of the recrystallized structure layer 13 on the inner peripheral surface 11 of the spoke attachment part 2. Even if the entire inner peripheral surface 11 including the tapered portions 3 and 4 is subjected to finish buffing by post-processing, a recrystallized structure layer 13 having a desired thickness is secured on the inner peripheral surface 11 of the tapered portions 3 and 4. The presence of such a recrystallized structure layer 13 can provide sufficient glitter as the surface appearance of the rim material 11.

  In addition, the recrystallized structure layer 13 is thinly formed over the entire outer peripheral surface 12 of the rim material 1. The thickness V of the recrystallized structure layer 13 is substantially uniform over the entire outer peripheral surface 12 of the rim material 1 and is greater than the thickness of the recrystallized structure layer 13 formed on the inner peripheral surface 11 of the rim material 1. Is also small. Therefore, the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the tapered portions 3 and 4, the thickness S of the recrystallized structure layer 13 on the inner peripheral surface 11 of the spoke attachment portion 2, and the outer periphery of the rim material 1. The thickness V of the recrystallized structure layer 13 on the surface 12 has a relationship of T> S> V. Specifically illustrating the thickness of each layer, the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the taper portions 3 and 4 is set in a range of 100 to 250 μm, and the inner peripheral surface 11 of the spoke attachment portion 2. The thickness S of the recrystallized structure layer 13 is set in the range of 80 to 180 μm, and the thickness V of the recrystallized structure layer 13 on the outer peripheral surface 12 of the rim material 1 is set in the range of 30 to 100 μm.

  In the drawing, the thickness of the recrystallized structure layer 13 is exaggerated for easy understanding that the recrystallized structure layer 13 is formed on the inner peripheral surface 11 and the outer peripheral surface 12 of the rim material 1. .

  Formation of the thickness distribution of the recrystallized structure layer 13 on the surface of the extruded material 30A as described above changes the length of the bearing surface of the extrusion die for each region as in the extrusion processing apparatus 60A of the first embodiment. This is possible with the configuration described above. The configuration of the extrusion processing apparatus 60A of the first embodiment will be described below.

  As illustrated in FIGS. 1 to 3, the extrusion processing apparatus 60 </ b> A includes an extrusion die 61, a container 65, and the like. The extrusion die 61 is provided with a bearing hole 62 (molding hole) for extruding the billet 66 loaded in the container 65. The cross-sectional shape of the bearing hole 62 is the same as the cross-sectional shape of the rim material 1. By passing the billet 66 through the bearing hole 62, the billet 66 is extruded to produce the rim material extruded material 30A. Reference numeral 64 denotes a relief hole of the extruded soybean 61.

  In the first embodiment, the material of the rim material extruding material 30A contains Zn: 6.4% by mass and Mg: 1.4% by mass, and the balance is Al—Zn—Mg based which consists of Al and inevitable impurities. It is an alloy. Extrusion conditions for producing the extruded material 30A include a billet temperature of 420 ° C. to 500 ° C. and an extrusion speed of 2 m / min to 15 m / min.

  30 A of extrusion materials are provided with the site | part corresponding to the spoke attachment part 2 of the rim material 1, and the site | part corresponding to the both-sides area | region parts 7 and 8 of the rim material 1, and both site | parts are mutually parallel in the extrusion direction E. It is formed to extend.

  Here, for convenience of explanation, a portion corresponding to the spoke attachment portion 2 of the rim material 1 and a portion corresponding to the side regions 7 and 8 of the rim material 1 in the extruded material 30A are respectively designated as the spoke attachment portion 2 and These are referred to as side region portions 7 and 8.

  Moreover, in this 1st Embodiment, 30 A of extrusion materials are formed in the surface of the internal peripheral surface 11 of the taper part 3 and 4 of the side area | region parts 7 and 8, and the recrystallized structure layer 13 is thicker than another site | part. This is the thick layer requesting portion 31 that is required.

  The bearing surface 63 of the extrusion die 61 is composed of the peripheral surface of the bearing hole 62. The length of the bearing surface 63 in the pushing direction E is different in the circumferential direction of the bearing surface 63.

  In addition, the length of the bearing surface 63 and its part described below means the length of the bearing surface 63 and its part in the extrusion direction E.

  As shown in FIGS. 2 and 3, the length of the portion (the tapered portion inner peripheral surface corresponding portion) 63 t corresponding to the inner peripheral surface 11 of the tapered portions 3, 4 of the side region portions 7, 8 of the extruded material 30 </ b> A on the bearing surface 63. The length L2 is set to be longer than the length L1 of a portion (spoke attachment portion inner peripheral surface corresponding portion) 63s corresponding to the inner peripheral surface 11 of the spoke attachment portion 2 of the extruded material 30A on the bearing surface 63 (that is, L2). > L1). Furthermore, the length L0 of the portion (rim material outer peripheral surface corresponding portion) 63v corresponding to the rim material outer peripheral surface 12 of the extruded material 30A on the bearing surface 63 is set shorter than L2 and L1 (that is, L2> L1). > L0).

  The length ratio L0: L1: L2 of the corresponding portions of the bearing surface is, for example, 1: 1.5-3: 2-4. Furthermore, L0 is set to a range of 2 to 4 mm, for example, L1 is set to a range of 3 to 6 mm, and L2 is set to a range of 4 to 8 mm, for example.

  By varying the length of the bearing surface 63 in the circumferential direction of the bearing surface 63 in this manner, the amount of machining strain applied from the bearing surface 63 changes in the circumferential direction of the bearing surface 63. Thus, the recrystallized structure layer 13 having a different thickness can be formed for each region on the surface of the extruded material 30A. That is, the recrystallized structure layer 13 (its thickness T) is formed thick on the surface of the inner peripheral surface 11 of the tapered portions 3 and 4 of the side regions 7 and 8 of the extruded material 30A, while the extruded material 30A On the surface of the inner peripheral surface 11 of the spoke attachment portion 2, a recrystallized structure layer 13 (its thickness S) is formed thinner than the thickness T of the recrystallized structure layer 13 on the inner peripheral surface 11 of the tapered portions 3 and 4. Furthermore, the recrystallized structure layer 13 (its thickness V) is thinner than the thickness S of the recrystallized structure layer 13 on the inner peripheral surface 11 of the spoke attachment portion 2 on the surface of the rim material outer peripheral surface 12 of the extruded material 30A. It is formed. Therefore, the rim material 1 manufactured by the extruded material 30A may be subjected to post-processing such as finishing buffing on the inner peripheral surface 11 of the tapered portions 3 and 4 of the side region portions 7 and 8 of the rim material 1. Since the recrystallized structure layer 13 is formed thick on the inner peripheral surface 11, sufficient glitter can be obtained.

  Further, in this extruded material 30A, the recrystallized structure layer 13 is formed thicker on the surface of the inner peripheral surface 11 of the tapered portions 3 and 4 than in other portions. At least one of mechanical properties (eg, yield strength, tensile strength), corrosion resistance (eg: SCC resistance), conductivity, thermal conductivity, and light reflection properties (eg: reflectance, glossiness, glitter) Can be different from other parts (regions). In addition, SCC property is stress corrosion cracking property.

  5-7 is a figure explaining 2nd Embodiment of this invention.

  In the second embodiment, as shown in FIGS. 6 and 7, the extruded material 30 </ b> B is used for a metal holding member (holding tool) 40 for caulking and holding a to-be-held body 44 having a substantially circular cross section. Yes, that is, the holding member 40 is made of the extruded material 30B.

  The holding member 40 is made of metal having a substantially U-shaped cross section (substantially U-shaped), and is made of aluminum. Further, the holding member 40 is configured as a pair of plate-shaped caulking portions 41 and 41 arranged to face each other apart from each other and a non-caulking portion in which the base end portions of the both caulking portions 41 and 41 are integrally connected. The concave portion surrounded by the two caulking portions 41 and 41 and the substrate portion 42 is used as an accommodating concave portion 43 that accommodates and holds the object to be held 44.

  Then, the holding member 40 closes both the caulking portions 41 and 41 so as to close the opening of the housing recess 43 as shown in FIG. 7 in a state where the body to be held 44 is housed in the housing recess 43 as shown in FIG. The holding body 44 is caulked and held by being bent and deformed plastically. In the second embodiment, the caulking portions 41 and 41 of the holding member 40 are low-strength request portions that are required to have lower proof strength than the substrate portion 42 of the holding member 40.

  A recrystallized structure layer 13 is formed on the entire surface of the holding member 40. The thickness F of the recrystallized structure layer 13 formed on the surface of each caulking portion 41 of the holding member 40 is the recrystallization formed on the other portion of the holding member 40, that is, the surface of the substrate portion 42 (non-caulking portion). It is larger than the thickness G of the tissue layer 13 (that is, F> G). Thereby, the proof stress as the mechanical strength in each caulking part 41 of the holding member 40 is locally reduced. Specifically, the thickness F of each layer 13 is set to a range of 200 to 1000 μm, and the thickness G of the recrystallized structure layer 13 of the substrate part 42 is 20 μm. It is set in the range of ˜300 μm.

  The extruded material 30B used for the holding member 40 includes a portion corresponding to both the caulking portions 41, 41 of the holding member 40 and a portion corresponding to the substrate portion 42 of the holding member 40, and both portions are parallel to each other. And extending in the extrusion direction.

  Here, for convenience of explanation, the portion corresponding to the caulking portion 41 of the holding member 40 and the portion corresponding to the substrate portion 42 of the holding member 40 in the extruded material 30B are referred to as the caulking portion 41 and the substrate portion 42 of the extruded material 30B, respectively.

  Further, in the second embodiment, the extruded material 30B is made of a thick-walled material that is required to form each of the caulking portions 41 (that is, the low-strength requirement portion) on the surface so that the recrystallized structure layer 13 is thicker than other portions. The layer request unit 31 is used.

  This extruded material 30B is manufactured by the extrusion apparatus 60B of the second embodiment of the present invention. The cross-sectional shape of the bearing hole 62 of the extrusion die 61 of this extrusion processing apparatus 60B is the same as the cross-sectional shape of the holding member 40 as shown in FIG.

  In the present second embodiment, the material of the holding member extrusion material 30B contains Mg: 1.0 mass% and Si: 0.8 mass%, and the balance is Al—Mg—Si based on Al and inevitable impurities. It is an alloy. Extrusion conditions for producing the extruded material 30B include a billet temperature of 500 ° C. to 550 ° C. and an extrusion speed of 10 m / min to 20 m / min.

  The length of the portion (fitting portion corresponding portion) 63f of the extruded material 30B on the bearing surface 63 of the extrusion die 61 corresponds to the portion of the bearing surface 63 corresponding to the substrate portion 42 of the extruded material 30B (substrate portion). Corresponding part) is set longer than 63 g. Specifically, the ratio between the length of the caulking portion corresponding portion 63f of the bearing surface 63 and the length of the substrate portion corresponding portion 63g is set to 1.5 to 20: 1, for example.

  According to the extrusion processing apparatus 60 </ b> B of the second embodiment, the length of the portion (caulking portion corresponding portion) 63 f corresponding to the caulking portion 41 of the extruded material 30 </ b> B on the bearing surface 63 of the extrusion die 61 is the extrusion on the bearing surface 63. Since the length of the portion corresponding to the substrate portion 42 of the material 30B (substrate portion corresponding portion) 63g is set to be longer, the recrystallized structure layer 13 is formed thick on the surface of the caulking portion 41 of the extruded material 30B. The recrystallized structure layer 13 is formed thinner than the caulking portion 41 on the surface of the substrate portion 42 of the extruded material 30B. Thereby, the proof stress of the crimping | crimped part 41 of the extrusion material 30B can be locally made lower than the proof stress of the board | substrate part 42 of the extrusion material 30B. Therefore, the caulking portion 41 of the holding member 40 can be deformed with a relatively weak force with respect to the holding member 40 manufactured by the extruded material 30B, and thus the caulking work can be easily performed.

  Although several embodiments of the present invention have been described above, the present invention is not limited to those shown in the above embodiments, and various modifications can be made.

  In the present invention, the extruded material is particularly preferably used for the rim material 1 and the holding member 40. However, the extruded material is not limited to these materials, and may be used for structural materials for vehicles, industrial equipment, and the like. It may be used.

  Moreover, in this invention, you may perform surface treatments, such as an alumite process, on the surface of an extrusion material after that, with the extrusion material manufactured with the extrusion processing apparatus.

  In the first and second embodiments, the extruded material is solid, but in the present invention, in addition, the extruded material has a hollow portion extending in the extrusion direction, that is, a hollow material such as a pipe material or a hollow panel material. It may be anything.

  INDUSTRIAL APPLICABILITY The present invention can be used for an extrusion processing apparatus for manufacturing an extruded material used for a rim material, a holding member, and the like and a method for manufacturing the extruded material.

1: Two-wheeled rim material 2: Spoke attachment portion 3: Tapered portion 4: Tapered portion 7: Side region portion 8: Side region portion 11: Inner peripheral surface 12: Outer peripheral surface 13: Recrystallized structure layer 30A 30B: Extruded material 31: Thick layer request section 40: Holding member 41: Caulking section (low strength request section)
42: Substrate part (non-caulking part)
44: Holding object 60A, 60B: Extrusion device 61: Extrusion die 63: Bearing surface E: Extrusion direction

Claims (8)

An extrusion processing apparatus for producing an extruded material,
The length of the extrusion surface of the extrusion die is different in the circumferential direction of the bearing surface ,
The extruded material is provided with a thick layer request portion that is required to form a recrystallized structure layer thicker than other parts on the surface,
That the extrusion direction of the length of the portion corresponding to the thick layer required portion of the extruded material in the bearing surface, is set longer than the extrusion direction of the length of the portion corresponding to the other portions of the extruded material in the bearing surface A featured extrusion processing apparatus. The extruded material is equipped with a low-strength demanding part that requires lower mechanical strength than other parts as a thick-walled demanding part,
Extrusion direction of length of the portion corresponding to the low strength requirements of the extruded material in the bearing surface, claim is set longer than the length of the extrusion direction of a portion 1 corresponding to the other portions of the extruded material in the bearing surface The extrusion apparatus as described. The extruded material is equipped with a low corrosion resistance requirement part that requires lower corrosion resistance than other parts as a thick layer requirement part,
Extrusion direction of length of the portion corresponding to the low corrosion resistance requirements of the extruded material in the bearing surface, claim is set longer than the length of the extrusion direction of a portion 1 corresponding to the other portions of the extruded material in the bearing surface Or the extrusion processing apparatus of 2 . Extruded material is used for rim material of motorcycles,
The portion corresponding to the spoke attachment portion of the rim material in the extruded material and the portion corresponding to the side region portion on both sides in the width direction with respect to the spoke attachment portion of the rim material are respectively designated as the spoke attachment portion and the side region of the extrusion material. Part
The extruded material is a thick layer requesting portion at least a part of the inner peripheral surface of the side region portion,
The length in the extrusion direction of the portion corresponding to the inner peripheral surface of at least a part of the lateral region portion of the extruded material on the bearing surface is the extrusion direction of the portion corresponding to the inner peripheral surface of the spoke attachment portion of the extruded material on the bearing surface. The extrusion processing apparatus according to claim 1 , wherein the extrusion processing apparatus is set to be longer than the length of. The extruded material is used for a holding member that holds the object to be held by caulking,
When the portion corresponding to the caulking portion of the holding member in the extruded material and the portion corresponding to the non-caulking portion of the holding member are respectively the caulking portion and the non-caulking portion of the extruded material,
The extruded material has a caulking portion as a thick layer request portion,
Extrusion direction of the length of the portion corresponding to the caulked portion of the extruded material in the bearing surface, the extrusion direction of the portion corresponding to the non-crimped portion of the extruded material in the bearing surface length set by the claim 1, wherein are longer than Extrusion equipment. A method for producing an extruded material for producing an extruded material by an extrusion processing apparatus,
The length in the extrusion direction of the bearing surface of the extrusion die of the extrusion device is different in the circumferential direction of the bearing surface ,
The extruded material is provided with a thick layer request portion that is required to form a recrystallized structure layer thicker than other parts on the surface,
That the extrusion direction of the length of the portion corresponding to the thick layer required portion of the extruded material in the bearing surface, is set longer than the extrusion direction of the length of the portion corresponding to the other portions of the extruded material in the bearing surface A method for producing an extruded material. Extruded material is used for rim material of motorcycles,
The portion corresponding to the spoke attachment portion of the rim material in the extruded material and the portion corresponding to the side region portion on both sides in the width direction with respect to the spoke attachment portion of the rim material are respectively designated as the spoke attachment portion and the side region of the extrusion material. Part
The extruded material is a thick layer requesting portion at least a part of the inner peripheral surface of the side region portion,
The length in the extrusion direction of the portion corresponding to the inner peripheral surface of at least a part of the lateral region portion of the extruded material on the bearing surface is the extrusion direction of the portion corresponding to the inner peripheral surface of the spoke attachment portion of the extruded material on the bearing surface. The method for producing an extruded material according to claim 6, wherein the method is set longer than the length of the extruded material. The extruded material is used for a holding member that holds the object to be held by caulking,
When the portion corresponding to the caulking portion of the holding member in the extruded material and the portion corresponding to the non-caulking portion of the holding member are respectively the caulking portion and the non-caulking portion of the extruded material,
The extruded material has a caulking portion as a thick layer request portion,
Extrusion direction of the length of the portion corresponding to the caulked portion of the extruded material in the bearing surface, the extrusion direction of the portion corresponding to the non-crimped portion of the extruded material in the bearing surface length according to claim 6, wherein is set to be longer than the Method for producing extruded material.

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